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Commitments and Contingencies (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Loss Contingencies [Line Items]          
Accrued environmental liabilities $ 48   $ 48   $ 50
Defined benefit plan underfunded amount $ 509   $ 509   613
Mr. Icahn and affiliates          
Loss Contingencies [Line Items]          
Affiliate ownership interest     90.60%    
Starfire Holding Corporation          
Loss Contingencies [Line Items]          
Ownership percentage by Mr. Icahn 99.40%   99.40%    
Pension funding indemnity agreement with subsidiary $ 250   $ 250    
Automotive Segment          
Loss Contingencies [Line Items]          
Accrued environmental liabilities 15   15   16
Possible material additional losses, above and beyond best estimate of required remediation costs     40    
Energy Segment          
Loss Contingencies [Line Items]          
Accrued environmental liabilities 4   4   5
Environmental remediation expense 2 $ 3 7 $ 6  
RINs costs 106 $ 51 99 $ 94  
Biofuel blending obligation 280   280   186
Railcar Segment          
Loss Contingencies [Line Items]          
Railcar loss contingency accrual 14   14    
Metals Segment          
Loss Contingencies [Line Items]          
Accrued environmental liabilities $ 28   $ 28   $ 28
Icahn Enterprises G.P. | Mr. Icahn and affiliates          
Loss Contingencies [Line Items]          
Affiliate ownership in parent company general partner     100.00%